Finding the Fourth Proportional to 81,189,488.39, 111,933,102.42 and 64,499,605.25

Step by Step Solution

1. Step 1: Write the proportion equation
   81,189,488.39 : 111,933,102.42 = 64,499,605.25 : x
2. Step 2: Convert to fraction form
   81,189,488.39/111,933,102.42 = 64,499,605.25/x
3. Step 3: Cross multiply
   81,189,488.39x = 111,933,102.42 × 64,499,605.25
4. Step 4: Simplify right side
   81,189,488.39x = 7,219,640,919,938,154
5. Step 5: Solve for x
   x = 7,219,640,919,938,154/81,189,488.39
6. Step 6: Final answer
   x = 88,923,345.42